Binary SMS

In order to send SMS messages containing ringtones, operator logos, WAP push or VCards, you need to send a binary message.

In order to send a binary message to a phone you will need to construct the User Data Header (UDH).

The UDH is a short hex code that tells the receiving handset what type of content is contained in the binary message and how to process it.

You must also set the correct Data Coding Scheme value, 0x04 or 4 in the case of Binary.

Most UDH's are for Nokia brand phones and Nokia have made available details for constructing Smart Messages in their Smart Messaging Specification.

Sony Ericsson have also made available information on constructing similar messages for their handsets and it is available at http://developer.sonyericsson.com.